Added error handling for nick changes.
Added error handling for nick changes.

frumiousbandersnatch/supybot-code,prashantpawar/supybot-rothbot,haxwithaxe/supybot,mazaclub/mazabot-core,kblin/supybot-gsoc,ProgVal/Limnoria-test,Ban3/Limnoria,buildbot/supybot,jeffmahoney/supybot,raboof/supybot,ProgVal/Limnoria-test,Ban3/Limnoria,mazaclub/mazabot-core